Sayang, cyst during pregnancy is something yang kena discuss properly with your doctor, jangan worry dulu okay, tapi memang kena follow up dengan OB/GYN you untuk make sure everything is okay. A few of us mums pun pernah dapat findings macam ni during scan, dan doctor explain apa yang normal and apa yang kena monitor. Please book an appointment dengan your doctor soon to get proper guidance, they'll tell you whether it's something yang resolve on its own or kena review lagi. You're doing the right thing by asking, but this one really needs your doctor's eyes on your case specifically. Take care!